Recording instrument



G. w. GRISDALE RECORDING INSTRUMENT Filed Oct. 31, 1

5 Sheets-Sheet 1 Dec. 8', 1925- 1564.559

G. w. GRISDALE RECORDI NG INSTRUMENT Filed Oct. 31, 1923 5 Sheets-Sheet 2 Dec. 8, 1925- G. w. GRISDALE RECORDING INSTRUMENT Filed Oct. 31, 1923 3 Sheets-Sheet 5 1%,... Dec. a, 1925.

UNITED STATES PATENT OFFICE.

- GEORGE W. GBISIlALE, OF 1PHILAIDELIHIA, PENNSYLVANIA, ASSIGNOB TO THE BROWN INSTRUMENT COMPANY, OF PHILADELPHIA, PENNSYLVANIA, A COR- PO ION OF PENNSYLVANIA.

nneoannwe msrnuunn'r.

Application filed October 81, 1928. Serial No. 871,962.

. of Philadelphia, county of Philadelphia,

State of Pennsylvania, have invented a certain new and useful Improvement in Record ing Instruments, of which the following is a specification.

The present invention relates to electrical recording instruments, and more particularly to the multiple recording type, in which a single instrument is arranged to be successively connected to a plurality of circuits each of which includes a heating element, so that the result is a. plurality of records on the chart respectively corresponding to the temperatures of the respective heating units of'the aforesaid electrical circuits.

Some of the objects of the present invention are to provide an improved electrically operated multiple recording instrument; to provide a. multiple recording instrument embodying a clock mechanism arranged to be automatically wound during the electrical operation oi the instrument; to provide a depressor bar, for an electrical instrument which is so balanced and 0 erated as to make a clear legible record without damaging any of the delicate parts by impact of the depressor bar, and which is also noiseless invoperation; to provide a depressor bar which is automatically caused to function in timed relation with respect to certain operating adjunctsof the instrument; to provide means for equalizing the weight of the depressor bar of an electrical recording instrument; to provide a mechanism including a solenoid for intermittently actuating certain adjuncts of the recording instrument; to provide an automatic contact control device for the circuit of-the operating solenoid to cause the solenoid armature to function in a noiseless manner; to provide an automatically operated contact mechanism whereby the supply of current to the instrument is maintained at the minimum. for operatingp'urposes; to pro vide an automatic make and break mechanism for controlling the solenoid of an electrical instrument whereby overheating of the solenoid coils is prevented: to provide a mechanism for intermittently actuating the recording ink ribbon controlling cam of a recording instrument; and to provide other improvements as will hereinafter appear.

In the accompanying drawings, Fig. 1 represents a side elevation partly broken away of a multiple recording instrument embodying one form of the present invention; F g. 2 re resents a section on line 2-2 of Fig. 1; Fig. 3 represents an elevation on line 3--3 of Fig. 1; Fig. 4 represents a detail on line 44 of Fig. 1; Fig. 5 represents a detail on line 55 of Fig. 1; Fig. 6 re resents a section on line 6-6 of Fig. 5; ig. 7 represents a section on line 7-7 of Fig. 5; Fig. 8 represents a detail in elevation on line 8-8 of Fig. 1; Fig. 9 represents a section on line 9-9 of Fig. 8; Fig. 10 represents a perspective detail of the circuit making and breaking switch; Fig. 11 represents a detail on line 1111 of Fig. 2; Fig. 12 represents a side elevation of an intermittent gear for actuating'the ribbon control cam; Fig. 13 represents an end elevation of the same; Fig. 14 represents a detail of the current control switch in closed circuit position; Fig. 15 represents a detail of the current control switch in oppn circuit position; Fig. 1 6 represents a diagram of the main control circuit. I v

Referring to the drawings, one form of the invention is shown in the several views in connection with an electrical recording instrument of themultiple recordin type; that is, a recording instrument whic is arranged to make a plurality of records ona chart or record sheet of a number of temperature conditions existing at a plurality of furnaces or other heating elements, the said records being made one at a time by suecessive connection of the circuits which transmit the temperature or temperature equivalents. It will be understood, however, that certain features of the invention are e ually as well applicable to an electrical recor inglinstrument of the single ty e that is, one w ich is arranged to record t e temperature or condition of a single unit only. In the present instance, a recording instrument 10 is shown, of the galvanometcr type, the movable system of which carries a pointer 11, which is arranged to travel in a path parallel to and in close proximity to a record or chart sheet 12, which is continuously fed in any well-known manner. In this type of instrument, the record is made upon the chart 12 by means of a colored ribbon13, which is fed between the pointer 11 and the chart 12, and impresses a dot or other symbol upon the chart by impact of the pointer 11 upon the ribbon. In the present instance, the ribbon 13 is of the multi-colored type, having one color to represent each furnace or heating element, or a combination of different colors of the ribbon as an identifying characteristic for a particular unit, such, for example, as fully set forth in co-pending application, Serial No. 657,245. The impression or impact means consists of a depressor bar 14, which is periodically operated to strike the pointer and thus, through the ribbon, make the desired impression upon the chart or record sheet.

For the purpose of actuating the depressor bar 14, and causing it deliver an effective blow to the pointer without, however, damaging the pointer or producing an audible sound, the said bar 14 has its side arms pivoted adjacent their rear ends to a suit-- able fixed part of the instrument frame, as shown at 15, so that the major portion of the weight of the depressor bar is toward the front of the instrument, and normally tends to fall by gravity toward the chart sheet 12. To one side of the depressor bar and in front of the fulcrum 15, a link 16 is pivotally connected, and joins at its other end a crank arm 17 fast-to a spindle or rock shaft 18, which is suitably journalled in the side walls of a casing 20, this latter serving, as will later appear, to contain the controlling and actuating mechanism for certain In order to periodlcally rock the spindle 18 to cause the depressor bar 14 to be raised preliminaril to making its impression stroke,

the spin 1e 18 has rigidly secured to it [an arm 21, from the end of which an actuating bar 22 is suspended. The latter termlnates at its lower end in an irregular-shaped head 23, formed at one side with a V tooth 24 and at the other side with a laterally and downwardly inclined face 25. The tooth 24 is arranged to mesh with the respective teeth of a cam 26, and the head 23 is nor- I mallyheld pressed into meshing enga ement with the said gear by contact of the inclined face 25 with a rotatably adjustable post 27 fast to the ca'sin 20. The cam 26 is driven from a main c ock mechanism 28 of any well-known type, andis geared to.

, ,thatasjits :teeth pick up the tooth 24, the

image-jasm ne intermittent movement,

lp'tbjtlre-lateral pressure of/ the (Figs. 2 and 11) is arts of the ap aratussion stroke but also drops the head 23 to bring the tooth 24 into mesh with the next succeeding tooth of the cam 26. The adjustable post 27 and cam-like face 25 serve to give the required lateral movement to the head under the action of the cam '26 and also distributes the weight of the parts so that excessive pressure on the gear is removed.

For the purpose of more perfectly balancing the depressor bar 14 and providing means whereby the adjustment of its working stroke can be varied, a coiled spring 30 rovided, having one end fast to a lug 31 of the casing 20 and its opposite end coiled'about the spindle 18 and made fast thereto in any desired manner. The coiling of this spring 30 is in the roper direction to normally place a nicely a justed tension upon the spindle 18, which acts opposite to the weight ofthe depressor'bar so that the impact of the bar is just suflicient to make a clear, legible impression upon the chart, while noise and dama e tothe delicate parts is avoided by the cushioning effect of the spring.

While the clockmechanism 28 forms no specific part of the invention, and ma be of any well-known type, one feature 0 the invention relates to the automatic winding of the main spring 32 of the clock mechanism, whereby it is maintained operative under all running conditions of the recorder. To that end, the staff 33 of the main spring 32 carries a ratchet 34 (Figs. 8 and 9) arranged to be engaged by a spring pressed pawl 35 pivoted to a gear 36. loosely mounted on the staff 33 and 1n mesh with a pinion 37 (Figs. 1' and3) on a counter-staff 38. .This'last carries a gear 39 fast thereon in mesh with a inion 40, loosely mounted upon a driving spindle 41 but fast to a rotatable casing 42 which is arranged to be driven by a coil spring 43, the outer end of which Is fast to the casing 42. and its inner end fast to the driving spindle 41 (see Fig. 6:. In order to transmit motion to the spind e 41, a ratchet 44 (Fig. 7) is ke ed or otherwise made 'fast tothe spind e 41, and is arranged to be given a step by step movement b means of a spring pressed pawl 45 pivote to a disc 46, which is fast to a gear 47, the latter being loosely mounted upon the spindle 41. An intermittent movement is imparted to the gear 47 through the medium-of agear segment 48 (Fig. 1) fixed to a shaft 49, which also has keyed thereon a secondgear segment 50 in mesh with a rack 51 formed on an extension 52 of the armature 53 of a double solenoid 54. The circuit control for the solenoid 54 will be later described.

From the foregoing, it will be evident that when the solenoid 54 is energizedand draws its armature 53 upwardly, as shown in the drawings, the rack 51- will transmit a counter-clockwise movement to the shaft 49 by means of the gear segment 50, and thus,

'by gear segment 47 impart a partial rotation to the disc 46 and pawl 45, whereby the ratchet 44 transmits the same movement to the spindle 41, which in turn winds the coil spring43. In consequence, the uncoiling of the spring 43 transmits motion by way of the pinion 40, gear 39, counter-staff 38, pinion 37, gear 36, to the staff 33, which results, in a winding of the main spring 32 of the clock mechanism 28, through the pawl 35 and ratchet 34. For starting purposes, the main clock spring 32 can be manually wound because t e staff 33 of the main spring 32 extends exterior of the casing 20 and may be operated by a knurled head or like means.

The intermittent rocking motion of the gear segment 48 and its shaft 49 is also utilized to impart a step by step motion to the. other units of the recording instrument, and in this instance an additional use is to cause an intermittent rotation of a multiple switch 55 (Fig. 3) by which the thermocouple circuits orother plurality of electrical circuits are connected one at a time 60, which serves to shift the ribbon carriage and position it for the making of different combinations of color records, such mechanism being fully described in applicants copending application, Serial No. 657,245. In the present construction, the cam is provided with a plurality of equally spaced laterally projecting pins 61, which are located in the path -of movement of an escapement element 62 fast" to a spindle 63 which has a gear 64 keyed thereon in mesh with a ear 650 upon the shaft 49.

The e ement 62 is provided with two oppositely arranged inwardly turned teeth 65 and 66, the opposite inner faces of which are of curved cam form toengage and cause the res ctive pins 61 to be moved through .a defimte arc of travel whenever the element 62 is oscillated. Thus, when the element 62 is rocked aboutits axis" 63, the tooth 65 is removed from engagement with and out of the path of one of the pins 61 which it tooth 66 willswing back to a position beneath the next succeeding pin 61 so that when it isagain rocked it will engage that pin and produceanother feeding step to the cam 60.

For the purpose of periodically energizing the operating solenoid 54, the two coils thereof are connected in parallel by conductors 70 and 71 (Fig. 16) with the leads 72 and 73, which are res ectively connected to the terminals 74 and 5 from the source of current supply, though the lead 72 includes in series with it a make and break switch 76 to automatically control the solenoid circuit. This switch 76 comprises astrip 80 (Figs. 1, 14 and 15) of flexible conducting material mounted in an insulating block 81, which also carries a second flexible conducting strip 82 spaced from the strip 80 and ingeneral parallel relation thereto, The strip 80 is provided with a contact 83 and the strip 82 is similarly provided with a contact 84, the two contacts 83 and 84-being arranged in uxtaposed relation and 'in relatively close proximity to each other but normally spaced apart so that there is no electric connection between the strip 80 and the strip 82. As a means for makingcontact between the two points 83 and 84, the strip 80 terminates in an extension finger 85 which is bent 'down- Wardly and outwardly, while the strip 82 terminates iii a finger 86, bent upwardly and outwardly, the two fingers 85 and 86 lying respectively in different vertical planes so that both are free to move up or down without interference or making contact one with the other.

It will be noted that the finger 85 is longer than the finger 86, for a purpose to be presently explained, and both fingers are arranged in the path of a cam 87 upon a shaft 88, suitably driven from the clock mechanism 28 at a redetermined speed of rotation. In thismstance, the cam is rov ided with two shoulders 90 and 91 atv ia'metri cally opposite points, so that theswitcll T6 functions twice for each rotation of 87. Except for brief instants immediately subsequent to the passage of the cam shoulders 90 and 91 past the end of the switch finger 86, the two fingers 85 and 86 rest upon the face of thecam and are so shaped that thecam then deflects the switch finger 86 sufliciently to hold the contact 84 out of engagement with the contact 83. As soon, however, asthe cam.87 rotates to a. place where the shoulder 90, for example, passes the shorter finger 86, the latter will snap from the high point of the cam to the low part, as shown in Fig. 14, and bring the. contact 841 into contact with the contact 83 to close the circuit, which thus causes energization of the solenoids 54. The solenoid energizingcircuit closed in the manner just isolplened" again as soon as the longer switch I gar 85 is permitted to snap of the corresponding cam shoulder, in

the example given); The time required for. f

i the relative movement of the cam-87 and as will shortly be described,-by

movement given to the conducting strips 80 I switch finger 85 necessary to permit the latter to snap oil? a cam shoulder and reopen the solenoid energizing circuit is shortened, the bodily and 82 when the solenoids 54 are energized. As soon as the solenoid is energized sufiiciently to cause the armature 53 to properly actuate the arts controlled by its movement,

it is desire le to break the circuit in order not only to prevent the armature, completing its stroke with an undesirable blow with its attendant noise and possible dam to delicate parts but also to prevent oter eating of the solenoid coils as well as waste. of current. To that end, the insulating block 81 of the switch 76 is fast to an arm 92 of a pivoted lever 93, the movement of which isguided by a pin 94 fast to a 'suitablefixed part, and extending through aslot 95 in the arm 92. Movement is transmitted to the arm 92 by means of a trip arm 96 which is cbnat the end of the desired contact period. It 7 will thus be seen that when the cam 87 reaches the point in its revolution where either the shoulder 90 or the shoulder 911eleases the fin r 86, the circuit will closed by contact 0 the points 83 and 84, and the solenoid 5d energized. This results in the ,de-

sired movement of the armature 53 but prior to the completion of its stroke, and after proper rocking dithe segment 50, the trip 98 picks up the extension 97 and thus transmits a movement to th arms 96 and 92 which shifts the switch 8 and causes the longer finger 85 to spring oil of the cam shoulder to break the circuit at the contacts 83 and 84.

(me-twentiethmf a second 511 p path of t It has been found that closingthe cir-- cuit of the solenoid 54 for a proximately files sufficient current to cause the solenoi -to-operate its armature 53 and transmit the necessary movements to the otheigparts which areto be intermittently actuated to carry out the several operations intended. This shorten- -:mg of the time the circuit is closed plays a very important part in the praetical opera: tion of the 1nstrument,.because 1t means not only a saving of current but also a diminution of the pull upon the armature 53 at just. the proper point in its stroke to damp" its movement, and thus revent violentimpact with the solenoi As heretofore stated, the shortening of the time in which current flows through the solenoid 54; eliminates the danger-of overheating the coils.

' In order to absorb the shock produced by the armature 53, when it falls by gravity,

upon deener ization of the solenoid, a shock absorbing e ement 100 (Figs. 1 and 2) in the form of a cushion of rubber orothe-r suitable Iyielding means is located in the e plunger extension 51, being su ported by a fixed plate 101 secured to t e casing 20, and so located as to be struck by the plunger 51 at substantially the end of its downward stroke.

The operation of the instrument is as follows: he recorder of the present invention is arran ed to be operated both mechanically an electrically, the mechanical movement being produced by a suitable clock mechanism 28, which has the function of feeding the chart aper 12, actuating-the cam for controlling t e opening and closing of theelectrical circuit, and operating'the {depressor which functions with the pomter- 11 to make an impression 'by means of the I ribbon 13 upon the'pa r 12. The electrical mechanism is in the orm of a periodically operated solenoid which serves to automatlcally maintain the vclock mechanism in wound condition, .to control the shifting of the recording ribbon from one position to another for producing different colored 'identifiv'ing characteristics upon-the chart 12, an to imparta step bylstep movement to the multiple switch w 'ch successively connects-the various circuits of the thermocouples to the instrument.

The energizationof the solenoid 54 is coni trolled by the make and break switch 76 under the action of the continuously rotatmg cam 87, the two fingers'85 and 86 of the switch member being normally in rest position upon the low portion of the cam.

to maintain, the contacts 83 and 84 se arated and the circuit open. When the high point of the cam is reached, both fin ers of the cam still ride overv it without altering the spaced relation between the contacts 83 and 84, but as soon as the shorter finger 86 tion to the chain of gears to wind the spring 43, which, in turn, produces a winding movement to the main clock spring 32. Simultaneously, the rocking movement of the shaft 49 causes the escapement 62 to rock, so that one of the pins 61 of the cam 60 is released, and is actuated and moved through a definite predetermined arc suflicient to produce the desired rotation of the cam for the purpose intended; Also the rock motion of the shaft 49 is transmitted by way of gears 56 and 57 to the rotatable element of the switch 55, which is thereupon shifted to a different position in order to connect a different circuit with the recording instrument. As soon as the armature 53 has reached the required point in its stroke to insure the foregoing motion to the parts controlled by it, the trip 98 strikes the finger 97, and causes the arm 96 to shift the switch 76, so that the long finger '85 thereof snaps from the high point of the switch sooner than it otherwise would, and thus breaks the circuit at the 7 member remote from said-tooth constrain,-

proper time in the cycle to cut ofi" the current from the solenoid after the latter has completed its work. As soon as the solenoid 54 is deenergized, the plunger 53 drops back by gravity, the impact thereof being cushioned by the member 100 and the parts assume their former position preparatory to the next intermittent movement. -'During the foregoing electrically operated steps, the clock mechanism is transmitting motion to the cam 26, and turns it .in a direction to in the next succeeding lift the head 23, link 22, and by means of the crank arms 21, 17,, shaft 18 and link i 16, gradually raise the depressor 14 preliminary to making. a record.. The upward movement of the head 23 is accompanied by a laterally swinging movement, due to the power applied by the cam 26 and the inclined cam face 25 sliding upon the pin 27, so that at the required point in the rotation of the cam 26 and with definite relation to the position of the other parts of the instrument, the head 23 automatically disconnects from the cam 26, and as the movement of the latter continues drops back to its former position, but it then entered space between the teeth of the cam 26. his releasingof the head 23 relieves the depressor bar 14 of the forceqactin counter to its weight, and, it thereupon alls to strike the pointer 11 with just sufiicient force'to make a sharp 1mpression upon the chart 12 by means of the ribbon 13. By varying the tension of the spring 30, the relative weights of the deressor and its actuating parts can be 'ad usted to a 'nicety and the depressor be thus caused to fall noiselessly and without damage to any of the parts. Furthermore, by supporting the link 22 and its connected parts upon the post 27, a considerable portion of its weight is removed from the cam 26, and thus relieves the clock mechanism from the total pressure due to the weight of these parts.

Although only a single form is shown in which this invention may be embodied, it is to be understoodvthat the invention is not limited to any specific construction, but mightbe applied in various forms without departing from the spirit of the invention or the scope of the appended claims.

Having thus described my invention, I

claim: 7 a

1. In a recording'instrument, the combination with a deflecting pointer, of means for intermittently depressing said pointer comprising a rotating'peripherally notched cam, a member having a tooth engaging the periphery of said cam, guiding means for a portion of said member adjacent said tooth compelling the latter to move tangentially as well as radially of said cam as it enters and leaves a peripheral notch of the latter, and guiding means for a portion of Said ing said last mentioned portion to movementalong a path approximately parallel to the tangential movement of said tooth.

2. In a recording instrument, the'combination with a deflecting pointerf-of means for intermittently depressing said pointer comprising a rotating peripherally notched cam, a movable guide, a member pivotally suspended from said guide and formed with a tooth engaging the periphery of said cam, and guiding means for a lower portion of said member compelling said tooth to' move tangentially as well as radially of said cam as 1t enters and leaves a peripheral .notch of the latter.

3. In a recording instrument, the combi nation ofan index member, a rock shaft, a depressor connected to said rock shaft to engage and disengage said index member member orcing the tooth of thmlil'ften to move toward the cam on adownwafil my -ment of the member tocarry said toothmto an adjacent cam notch; and limiting the movement of the tooth away from the cam as said suspended member is moved upward.

4. In a recording instrument, the combination of an index member, a depressor bar arranged to drop by gravity to depress said index member, a'step by step mechanism for eriodically operating said depressor bar, including means for automatically releasing said mechanism from said depressor bar, find forretarding the fall of said depressor 5. In a recording instrument, the combination of an index member, a depressor bar arranged to drop by gravity to depress said index member, a step by step mechanism for periodically raising said depressor bar, means for automatically releasing said mechanism from said depressor bar, means for retardin the fall of said depressor bar, and adjusta le means for varying the im: pact of said depressor bar with said index member.

6. In a recording instrument, the combi-'' nation of anindex member, a depressor bar pivotally mounted to drop by gravit to depress said index member, a rock ever mechanism connected to said depressor bar to raise said-bar, a head pivoted to said rocking mechanism and having an inclined face at one side andagear tooth at the opposite side, an adjustable support engaging said inclined face, and a cam having teeth-successively-engaging said head tooth whereby said head is periodically elevated to actuate said rocking mechanism.

7. In a recording instrument, the combination of anin dex member, a depressor bar pivotally mounted to drop'by gravity to depress said index member, and means 1ncludin a pivotally suspended head for periodical y raising'said depressor bar.

' ing sai 8. In a recording instrument, the combination of an index member, a depressor bar pivotally mounted to drop by gravity to depress said index member,-and means for periodically raisin said depressor bar comrisin a rotatab e cam, a member actuated y sai cam, and guiding. means forcausing said member to move bodily in a direction generally tangential to said cam on each actuation of the member by the cam.

9. In a recording instrument, the combination of an index member, -a depressor bar pivotally mounted to drop by gravity to depress and index member, means including a pivotally mounted head and a rotatable cam coacting therewith for periodically raising saidde ressor bar, and means for support head on the side opposite to said 10. In a recording instrument, the combination of an index member, a depressor bar pivotallv mounted to drop by "gravity to uspress-said index member, airock lever mechaconnected to said depressor bar to ra se said bar, a' head pivoted to said rocking mechanism and having an inclined lower face, a fixed member engaging said inclined face to support said head at one side, and means including a rotatable cam for periodically raising said head and causin t to move out of mesh with said cam w ereby said depressor bar is released to fall by gravity.

l1 Ina recording .instrument, the combination of an index member. a depressor bar pivot-ally mounted to drop by gravity to de-- press said index member, a rock lever mechanism connected to said depressor bar to raise said bar, a head pivoted to said rocking mechanism and having an inclined lower face, a fixed member engaging said inclined face to support said head at one side, means including a rotatable cam for odically'raising said headand causin it to move out of mesh with said cam w ereby said depressor bar is released to fall by gravity, and means for adjustably contro ling the counter-balancing of said depressor bar. y

12. In a recording instrument,the combination of an index member and a depressor,

of actuating means for the depressor comprising a rotating gear-wheel having flat tened teeth, a member, a connection between said member-land depressor comprising a pivotal suspension for said member located above the gear wheel, said member being formed with a toothat the upmoving side of the gear wheel adapted to enter the spaces between the gear wheel teeth, and guiding means-for the de nding end of themember for causin the atter to be moved tan cmtially oft e gear wheel when its .toot -is I bination of an index member, a depressor. a

rotatin cam formed with peripheral notches,

"a mem r having'a tooth movable radially of said cam to enter and leave the notches thereof and moved bythe cam. tangentially of-the latter while received in a notch them-' of to thereby=movesaid depressor in one direction, and having a ten ency to move tangentially of the cam in the opposite direction, and gm means for said member compelling said tooth to share in a limited tangential movement of the cam when entered-in any notch thereof before moving radia'lly out of the notch and compellingthe tooth after leaving one 'ca'm notch and while connected to the rock shaft, a member pivotally connected to and suspended from said crank arm and provided with a lateral projection from its depending portion, a rotating cam formed with peripheral notches into which said projection is adapted to enter, said mechanism being loaded with a tendency to move said projection tangentially of said cam in a direction opposite to the projection, and guiding means forthe depending portion of said member causing said projection to move radially inward with respect to the cam to enter an adjacent cam notch as,.thc projection moves tangentially of the'cam nnderits loading tendency, and

compelling the projection to share a limited tangential movement of the adjacent portion of the 'cam after hemg entered in a not-ch therof before n'ioving radially out of the not h.

15. In 1 recording instrument, the combination of a recording mechanism including a chart, a colored impression ribbon, a pointer, electrical means for controlling said pointer, and a depressor bar, means including a clock mechanism for actuating said depressor bar, said chart and the feeding of said ribbon, a winding device for said clock, a rotatable switch for separately connecting electrical circuits to said pointer controlling means, a cam for varying the position of said ribbon relative to said chart, and means including a solenoid for separately actuating said winding means, said rib;

bon cam and said rotatable switch in' timed relation.

16. In a recording instrument, the combination of a recording mechanism including a chart, a colored impression ribbon, a pointer, electrical means for controlling said pointer, and a depressor bar, means including a clock mechanism for actuating said depressor bar, said chart and the feeding of said ribbon, a cam for varying the position of said ribbon relative to said chart, a plurality of pins projecting laterally from said cam, an escapement arranged to coact with said pins, and means including a solenoid for actuatin said escapement.

17 In a recor ing instrument, the combination of a recordingmechanisni' including a chart, a colored -lmpres's'ion-- ribbon, a pointer, electrical means for controlling said pointer, and a de ressor bar, means including a clock mec ianism for actuating said depressor bar, said chart and the feedingof said ribbon,--a winding" device for said clock, and means including a solenoid for intermittently winding said Wind ng mechanism. v

18. In a recording instrument, the combination of a recording mechanism including a chart, a colored impression ribbon, a pointer, electrical means for controlling said pointer, and a depressor bar, means including a clock mechanism for actuating said depressor bar, said chart and the feeding of said ribbon, a rotatable switch for separately connecting electrical circuits to said pointer controlling means, and means including a solenoid for intermittently operating said switch.

Signed at Philadelphia, in the county of Philadelphia, State of Pennsylvania, this 11th day of October, 1923.

GEQRGE IV. GRISDALE. 

